Power machine for bending metal bars or rods



M. H. McKENNA. POWER MACHINE FOR BE ND|NG METAL BARS 0R RODS.

APPutAfloN F'ILED 050.5. 19 2i.

Patented May 2, 1922;

5 SHEETS-SHEET M. H. MCKENNA- POWER MACHINE FOR BENDING METAL BARS 0R RODS.

APPLICATION FILED DEC-5| I92!- Patented May 2, 1922.

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POWER MACHINE FOB BENDING METAL BARS .OR RODS. APPLICATION FILED 050.5. I921.

1,414,744.. Patented May 2, 1922'.

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APPLICATION FILED QEC|5| 192']. .0 1,414,744, Patented May 2,1922.

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. M- M Y M. H. McKENNA. POWER MACHINE FOR BENDING METAL BARS on RODS.

APPLICATION FILED DEC.5| l92l- Patented May 2, 1922.

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LLU LLJJ V M H Mf/7l E/7/0/ a ap is hi fi hatl e MICHAEL H. MCKENNA, O1 CLEVELAND, OHIO.

rowan, i/iaorirnn non ennnrna runner. sales on none.v

Application filed December To all whom it may concern:

Be it known that l, Miormnn l'l. Mo :KENNA, citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Power Machines for Bending Mal Bars or Rods, of which the following is a specification.

This invention relates to power machines for bending metal bars or rods, especially stirrups such as are used in reinforced concrete construction. Its principal object is to provide a machine of this character which will be simple, efhcient, durable and economical in operation.

In the drawings, Fig. 1 a side elevation of the machine; Fig. 2 is a top plan view thereof; Fig. 3 a transverse section on the line 3-3 of Fig. 1; Fig. 4 is a section on the line 1& of Fig. 2; Fig. 5 is a frag- V mentary plan view showing the arrangement of dies for bending a 45 angle; Fig. 6 is a View similar to Fig. 5 showing the arrangement of the dies for bending a loop and Figs. 7, 8, 9, and llare perspective views of different types of stirrups that may be made by this machine. I

The machine is supported by two side framesl held in spaced relationship to each other by a plate 2 in the rear. A motor 4 having an armature shaft5 is bolted to the plate 2. Keyed to the shaft 5 is a small gear 6 which meshes with the large gear 7 keyed by a stub shaft 8, said stub shaft extending outwardly from one part of a clutch mechanism 9 and being rotatably mounted upon a transverse shaft 10. The shaft 10 has rigidly secured thereto the other member of the clutch mechanism 9. Keyed to the shaft 10 between the side frames 1 is a small gear 11 which meshes with the large gear 12 carried by a shaft 13 mounted in hearings on the upper edge of the frames 1. Keyed to the outer ends of the shaft 13 are crank disks 15 having mounted therein crank pins 16 to which are pivotally connected one end of connecting rods 17, the other end of said rods being pivotally connected to a cross head 18 which is adapted to be moved back and forth upon the upper surface of the frames 1. The cross head 18 is slidably mounted on the frames 1 by strips 19 bolted to projections 20 on the lower side of the cross head, said strips 19 extending under guide flanges 21 on the sides of the frames 1.

The clutch 9 is operated by a lever 22 Specification of Letters Patent.

5, 1921. Serial no. 519,951.

which is pivoted at 23 to a bracket 2-1 attached to the frame 1. A. rod 25 connects the lever 22 with the lever 26 on the opposite side of the machine which is pivoted at 27 to an arm 28 projecting outwardly from that side of the machine so that the clutch can be operated from either side of the machine.

Bolted to the front of the cross head 18 is a plate 29 having a series of threaded holes 30 therein into which studs 31 can be screwechsaid studs holding dies or gigs 32. This multiplicity of holes enables the dies 32 to be located in any desired position. A bed plate 33 having a series of holes 34 therein is attached to the upper face of the frames 1 by bolts 35 extending upwardly through the frames and a stud 36 threaded in ears 3'? on the frame prevent the plate 33 from being moved l'earwardly when the machine is operated. Dies 38 are attached to the plate 33 by bolts 39.

A rod 40 extends outwardly from the plate 33 and has adjustably secured thereto a plate 41 which is used as a stop when placing the bars in the machine.

The bars are laid on lugs or bloclzs in which are adjustably mounted in slots 43 in the plate 33 by slots and screws 51.

In operation the proper dies for making the stirrup desired are attached to plates 29 and 33 and the cross head isdrawn back to its rearmost position. The proper length rod is then laid on the lugs 21, one end of said rod abutting against the stop 4-1 to position the same correctly and then the clutch is thrown in to move the cross head 29 forwardly bringing the dies carried thereby into contact with the rod and bending it around the dies carried by the plate For bending 15 angles as illustrated in Fig. 5 a block 14 which acts as a guide or stop for the rod is carried by the plate 33 in addition to its dies 38. The dies are all made up of cast iron holders 4:5 which carry hardened steel parts 16, the cast iron parts 4-5 being attached to theplates 29 or 33 and the hardened steel parts engaging the rod to bend it.

I claim:

1. In a bending machine, the combination of a reciprocating cross head, a face plate secured'to the front thereof and having rows of holes extending across the same, dies provided with attaching devices engaging in said holes, and adjustable laterally to vary their position on the face plate, a bed plate Patented May a, ieee.

having rows of holes extending across the same, and also having a plurality of slots therein, dies mounted on top of the bed plate and having attaching devices engaged in the holes therein and adjustable laterally to vary their position on the bed plate, and Work holders mounted in the slots between the dies.

2. In a bending machine the combination of a reciprocating cross head provided with spaced dies on the face thereof, a bed plate having spaced dies mounted thereon, in the Ll l/M line of movement oit the cross head, said plate having slots between its dies, and. Work supporting blocks ad ustably mounted in 15 said slots, to support the Work between the dies.

In testimony whereof, I affix my signature 1n presence of two Witnesses.

MICHAEL IVIGKENNA.

Witnesses JOHN A. BoMMI-IARDT, BESSIE F. POLLAK. 

